This is a listing for the mont-bell Merino Wool Plus Hybrid Zip Shirt Men's. This zip shirt uses Merino Wool Plus on the front, which provides excellent heat retention, and Wickron ZEO Thermal on the back, which is excellent at absorbing and dispersing moisture, effectively releasing stuffiness. It can be used as an inner layer in the fall and winter, and as an outer layer in the spring, making it useful throughout the year. [Front] 83% wool, 17% polyester [Back] 100% polyester [Listed Size] S Thank you for viewing. Gender...Men's Features...Merino Wool